THE CANDIDATE INTERMEDIATE-MASS BLACK HOLE IN THE GLOBULAR CLUSTER M54

被引：21

作者：

Wrobel, J. M. ^{[1
]}

Greene, J. E. ^{[2
]}

Ho, L. C. ^{[3
]}

机构：

[1] Natl Radio Astron Observ, Socorro, NM 87801 USA

[2] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[3] Observ Carnegie Inst Sci, Pasadena, CA 91101 USA

来源：

ASTRONOMICAL JOURNAL | 2011年 / 142卷 / 04期

关键词：

black hole physics; globular clusters: individual (M54); radio continuum: general; X-rays: general; DWARF SPHEROIDAL GALAXY; RADIO OBSERVATIONS; FUNDAMENTAL PLANE; LARGE ARRAY; ACS SURVEY; SAGITTARIUS; G1; EMISSION; CHANDRA; LIMITS;

D O I：

10.1088/0004-6256/142/4/113

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Ibata et al. reported evidence for density and kinematic cusps in the Galactic globular cluster M54, possibly due to the presence of a 9400 M-circle dot black hole. Radiative signatures of accretion onto M54's candidate intermediate-mass black hole (IMBH) could bolster the case for its existence. Analysis of new Chandra and recent Hubble Space Telescope astrometry rules out the X-ray counterpart to the candidate IMBH suggested by Ibata et al. If an IMBH exists in M54, then it has an Eddington ratio of L(0.3-8 keV)/L(Edd) < 1.4 x 10(-10), more similar to that of the candidate IMBH in M15 than that in G1. From new imaging with the NRAO Very Large Array, the luminosity of the candidate IMBH is L(8.5 GHz) < 3.6 x 10(29) erg s(-1) (3 sigma). Two background active galaxies discovered toward M54 could serve as probes of its intracluster medium.

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页数：4

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